Looking for a Resend alternative?
Resend facts were verified on their own public pages on July 17, 2026 — including the parts that are genuinely excellent.
Facts verified 2026-07-17 — corrections: hello@emailfast.dev
Resend earned its polish: the smoothest developer brand in email and the best agent surface anywhere — two llms.txt files, an MCP server, an agent homepage. The differences live lower in the stack: data stored US-only with no EU residency, no published customer-held key story, a subprocessor list that includes LLM vendors, and a migration offering that rewrites your code instead of accepting it.
The comparison
| Resend | Email Fast | |
|---|---|---|
| Key custody | No at-rest customer-key encryption story published | organizations can bring their own encryption keys — enroll, rotate, suspend, or revoke — and revocation fails closed: new sends are rejected and stored secrets become unreadable, to us included |
| Data residency | US-only; no EU option; DPA modifications are enterprise-only | Dedicated infrastructure in the EU (Germany) — security |
| Content and AI | Subprocessors include LLM vendors (Anthropic; RunPod for “self-hosted LLMs”); robots Content-Signal declares ai-train=yes | Message content is never shared with model-training pipelines — subprocessors |
| Certification | SOC 2 Type II; report gated behind a login | None yet — open, crawlable security page |
| Free tier | 3,000 emails/month (100/day) | 2,500 emails/month, never expires |
| Dedicated IP | $30/month | Available on Growth, included on Scale (pricing) |
| Migration tooling | A code converter — your calls get rewritten | SendGrid-, Mailgun-, and Postmark-compatible endpoints: point your existing SDK at a new base URL with a new key and keep your code |
Where Resend is the right choice
- Developer experience is the deciding factor and US-only data storage is acceptable for you. Their polish is real.
- You need a certification today. Their SOC 2 Type II exists — ask for the report; it's behind a login, but it's theirs. We hold none yet.
- You work agent-first. Their MCP and llms surface set the industry standard, and they publish roughly 45 customer logos; we're in early access with none.
Switching
Honesty first: we don't have a Resend-compatible endpoint, so unlike our SendGrid, Mailgun, and Postmark paths, leaving Resend is a small code change, not a base-URL swap: SDKs for the browser (EmailJS-compatible), Node.js, Python, PHP, Go, and Ruby, plus a zero-dependency CLI and a published OpenAPI specification. Start dry with a sandbox key — sandbox keys (ef_sandbox_…) that run the real pipeline dry: real validation, real rendering, real events, a hosted capture inbox — and no email leaves. Live delivery opens at launch.
Resend is a trademark of its owner; Email Fast is not affiliated with or endorsed by them. Facts about Resend were verified on their public pages on the date above — corrections: hello@emailfast.dev.
Questions, answered plainly
Does Resend use my emails to train AI?
We can only report what their public pages state, and you should read them yourself: the subprocessor list includes LLM vendors (Anthropic, and RunPod for “self-hosted LLMs”), the robots Content-Signal declares ai-train=yes, and DPA modifications are enterprise-only. What that means for your message content is a question for their DPA. Our position: message content is never shared with model-training pipelines — see /security.
Is Resend SOC 2 certified?
Yes — SOC 2 Type II per their site, with the report gated behind a login. Email Fast holds no third-party certification yet — what we ran instead is a 19-stage adversarial security review, run to zero confirmed findings. That review was internal and adversarial — a documented find→refute→fix→re-verify loop — not a third-party audit. We say exactly which one we have.
Can I keep my Resend code?
Not unchanged — there is no Resend-compatible endpoint here, so this switch is a code change. If you also run SendGrid, Mailgun, or Postmark code anywhere, that part moves without a rewrite: SendGrid-, Mailgun-, and Postmark-compatible endpoints: point your existing SDK at a new base URL with a new key and keep your code.
Where does my data live with each?
Resend stores data US-only with no EU residency option. Email Fast runs on dedicated infrastructure in the EU (Germany); details on the security page.